* {
  margin: 0;
  padding: 0;
}

.progress {
  border: 1px solid red;
  position: relative;
  width: 50%;
  height: 20px;
  margin: 0 auto;
  background-color: #f5f5f5;
  display: flex;
  align-items: center;
}

.progress .mask {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1000;
  width: 100%;
  height: 100%;
  background-color: transparent;
}

.progress .bar {
  width: 0;
  height: 50%;
  background-color: #008ac5;
}

.progress .circle {
  position: absolute;
  left: -10px;
  top: 0;
  width: 20px;
  height: 100%;
  border-radius: 50%;
  background-color: burlywood;
  opacity: 0.5;
}
